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arXiv 1702.07077math.DGmath.AP
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完全非线性共形不变方程的Min-oo猜想

Min-oo conjecture for fully nonlinear conformally invariant equations

Ezequiel Barbosa, Marcos P. Cavalcante, José M. Espinar

摘要:

在本文中,我们显示了刚性的结果,完全非线性椭圆共形不变方程的子域上的标准$n$ -球$\mathbb S^n$在适当的条件下沿边界。我们强调,我们的结果并不假设完全非线性方程,我们将工作。这证明了刚性的紧凑连接局部共形平坦流形$(M,g)$的边界,使Schouten张量的特征值满足一个完全非线性椭圆不等式,其边界等距的测地球$\partial D(r)$,其中$D(r)$表示一个测地球的半径$r\in (0,π/2]$在$\mathbb S^n$,并完全脐的平均曲率下界的平均曲率这测地球。在上述条件下,$(M,g)$必须等距于闭测地线球$\overline{D(r)}$。作为一个副产品,在尺寸$2$我们的方法提供了一个新的证明Toponogov定理的刚性紧凑的表面进行最短的简单测地线。Toponogov定理大致等价于双曲三维空间$\mathbb H^3$中球冠的刚性定理。事实上,我们将其推广到某些蒙日-安培方程的上解的刚性。

英文摘要:

In this paper we show rigidity results for super-solutions to fully nonlinear elliptic conformally invariant equations on subdomains of the standard $n$-sphere $\mathbb S^n$ under suitable conditions along the boundary. We emphasize that our results do not assume concavity assumption on the fully nonlinear equations we will work with. This proves rigidity for compact connected locally conformally flat manifolds $(M,g)$ with boundary such that the eigenvalues of the Schouten tensor satisfy a fully nonlinear elliptic inequality and whose boundary is isometric to a geodesic sphere $\partial D(r)$, where $D(r)$ denotes a geodesic ball of radius $r\in (0,π/2]$ in $\mathbb S^n$, and totally umbilical with mean curvature bounded below by the mean curvature of this geodesic sphere. Under the above conditions, $(M,g)$ must be isometric to the closed geodesic ball $\overline{D(r)}$. As a side product, in dimension $2$ our methods provide a new proof to Toponogov's Theorem about the rigidity of compact surfaces carrying a shortest simple geodesic. Roughly speaking, Toponogov's Theorem is equivalent to a rigidity theorem for spherical caps in the Hyperbolic three-space $\mathbb H^3$. In fact, we extend it to obtain rigidity for super-solutions to certain Monge-Ampère equations.

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